 | I am choosing a pair of binoculars. What factors should I consider? |  |
 | The following factors are the most important in determining binocular performance: objective lens diameter, magnification, the type and quality of the objective lens glass, type of lens coatings and t |
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| What is the diameter (objective size) of a pair of binoculars? |  |
| The objective lenses of binoculars are the front lenses. The diameter of one of these lenses, given in millimeters, will be the second number describing a particular binocular. Hence, a 7x42 binocular has an |
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| What is the field of view of a pair of binoculars? | |
| Your binoculars field of view is the width of the area you can see. It’s usually described in two ways: angular field of view and linear field of view. |
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| What is the exit pupil for binoculars? | |
| The exit pupil is width of the beam of light leaving the eyepiece. It’s usually measured in millimeters. A large exit pupil is advantageous under low light conditions and at night because the larg |
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| What is the eye relief for binoculars? | |
| Eye relief is the distance (in millimeters) that a binocular can be held from the eye and the full field of view can still be comfortably observed. It measures the spacing from the last surface of the eye le |
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| I want to know: what determines the brightness of the image in my binoculars? | |
| Brightness is important to consider when comparing different pairs of binoculars. It impacts your overall ability to see things (sky objects, animals and land |
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| What is the resolution of my binoculars? | |
| Resolution is a measurement of a binocular’s ability to distinguish fine detail and produce a sharp image. Better resolution also delivers more intense |
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| Is image contrast important for binoculars? | |
| Contrast is the difference in brightness between the bright objects in your field of view and the background compared to the background. It’s important because good contrast is needed for seeing fainte |
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| What does near focus mean for binoculars? | |
| Near focus is simply the distance between the binocular and the nearest object you can focus on. In general, you can focus closer with lower magnification and smaller aperture binoculars. |
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| Coated, fully-coated, multicoated, fully-multicoated, phase-coated binocular optics. Why are these important? | |
| Optical coatings reduce internal light loss and glare and ensure even light transmission, resulting in greater image sharpness and contrast. Binoculars may have 10-18 glass surfaces, each one contributing to |
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| Roof and porro prisms - what is the difference? | |
| Roof and porro prisms are two major types of prisms used in binoculars.Binoculars re |
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| What are some important features of binocular construction? | |
| Compactness and ruggedness are two major features to consider when looking for a pair of binoculars. Compactness relates to whether roof, porro or other prisms are used in the binoculars. Water resistance |
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| How do I collimate my binoculars? | |
| Collimation is the alignment of the optical elements to each other and the mechanical housing of the binoculars. Good collimation prevents eyestrain, headaches, inferior and double images while improving res |
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| What is the magnification of a pair of binoculars? | |
| Magnification is the degree to which the object being viewed is enlarged. For example, with a 7x42 binocular, the number 7 represents the binoculars power. A binocular of the power 7 magnifies an image to se |
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| How do I use the distance and size calculator on my Oceana binoculars? How accurate is it? | |
| Your Oceana binoculars have a built-in etched ruler or reticle in the optical system to allow you to measure angles in the field of view. Once you measure an angle, you can use that number with the calculato |
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| What is interpupillary distance? How do I adjust it on my binoculars? | |
| Interpupillary distance (IPD) is the distance between the pupils of your eyes measured from center to center when your eyes are focused on infinity. It varies from person to person. IPD is also smaller when |
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| What is diopter and why is it important? How do I focus my binoculars? | |
| Diopter is a measure of the optical power of a lens, which is determined by lens focal length. It’s widely used for eyeglasses, where it is defined as the inverse focal length of the lens in meters. A |
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| How do I mount my binoculars on a tripod? | |
| Most Celestron binoculars have built-in 1/4x20 female threads (socket) to use with Celestron’s binocular tripod adapter or similar aftermarket accessory |
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| What are eyecups? How do I use them? | |
| Eyecups are simply shades that prevent extraneous light from distracting your vision or entering the eyepiece while using your binoculars. Usually they are rubber and can be folded out of the way or removed |
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| When should I use my binoculars on a tripod? | |
| Binoculars are a great invention simply because they are extremely portable and need no other accessory. However, if the pair’s magnification is too high or they are heavy and hard to comfortably hold |
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| Why is the view of faraway scenes through my high-power binoculars so blurry? | |
| Terrestrial viewing is best done with a magnification of 15x to 60x. If you exceed 60x magnification, a view can be blurry because the of earth’s atmosphere. Heat waves and high-altitude winds move a |
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| How do I put the neck strap on my binoculars? | |
| Though it can be done in many ways, here’s one good way that is secure and that won't be twisted.Choose the side of the strap t |
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